Shaper for grinding wheels



Nov. 4 1924. ,758

' B. M. W. HANSON SHAPER FOR GRINDING WHEELS Filed 00-12. 23. 1920 um/w toz Patented Nov. 4, 1924.

UNITED s-T ATE-S.

PATENT OFFICE,

BENG-T 'M. W. .HAN SON, OFH-ARTFORD, CONNECTICUT.

sHAP-Enroncnwnme WHEELS;

:Appflication' filed October ea, 1920. Serial No. 419,120.

7 '0 all whom "in may concern:

Be it known that I, BENGT M. WV. HAN- sort, a citizen of the United States,.anda resident of Hartford, in the county of 5 Hartford, State of Connecticut, have in- VVhitworth type and to which use thepresent device'is peculiarly adapted, butit'isto be understood that the present disclosure is by way of illustration only, it not-being intended to'limit the invention to thisparticular use and it being susceptible of" other embodiments than that herein shown.

The object of the invention-is to provide a device for shaping the edge of a grinding wheel so that it conforms with the greatest accuracy and precision in contour and size to the cut to be taken in thework.

In the accompanving drawings Fi 1 is a top plan view of so much of a grin ing machine as is necessary to illustrate the present invention. 1

Fig. 2 is a side view of the'carriage on which the device of the present invention is mounted.

Fig. 3 is an end view of the shaper.

So much of the grinding machine as is illustrated in the drawings is shown more or less diagrammatically as the particular construction thereof forms no part of the present invention. In the present caseythis machine has a bcda carrying agrinding wheel 6 driven by abelt a. d is a carriage movable to and from the grinding wheelby the hand wheel 0, and f 1s across slide onthe carriage and supporting the'shaper ofthe present invention.

The shaping tool inthe present illustrative disclosureis in the form of a roller 10 longitudinally fluted as at 11 and having one 'or more circumferential grooves 12 conforming in cross section to the precise shape and size of the cutto betaken-in'the work. Fig. 3 shows the rolleras it isin actual practice and from this figure it will be seen that there are a relatively largenumber of eliminate the-necessity offrequent replace and when the surface of one of theygrooves pulling the r0 er to rotate'inthe opposite direction at substantially the same peripheral speed.

flutes 1 1 s 0 as'lto give :to each gr0ove'12 a multiplicity of edges 13. In Figures 1 and 2- the' roller, for purpose of convenience in illustration, is shown as having a (fewer number of flutes-thanarepresent in actual practice; In the prcsent'instance theshaper .hasitwo grooves 12 but't-henumber maybe varied, preferably therefbeing more than one to efiect economy in manufacture, to.

ments, and to permlt of retruing of the grooves 1'2by the grinding wheel as herein- .after described. In orderto'insurethat the grinding wheel and the roller while operating upon. one another are in proper rela- 7n tive positions, the roller has a free movement axially. Byway of example, the roller may be mounted ona-v spindle 14 on. which 1t is freely rotatable and along which it may freely'float longitudinally. J 1

'lofinatlly shape theedge of thegrinding wheel to the precisesize and contour desired, the carriaged is moved forward to bring the roller up to the grinding -.wheel,

12 engages the grinding wheel, the roller will float or adjust itself'longitudinallyinto...

such position that-the groove andgrinding wheelarein exact alinement. Thegrinding wheel, while the roller is being'urged'ithereagainst, is slowly rotated as :by manually on the belt 0 "causing, of course,

The edges 13 provided at the'intersectionsof the-flutes and grooves of the roller will have .a crushing orpicking action on the: grinding ing wheel that will rapidly bring-the edge thereof to the exact-shape o'f'the oovein the roller, which-shape,asfprevious y stated,-

.95 corresponds precisely with-the 'Whitworth thread to be out. =Each edge 13 asitis brought into engagement with the wheel have a very slight pecking or knocking action therebybreaking-ofi of the Wheel-very small fine particles, and .whileftheeffect ofthe engagement of each edge on the wheel is extremely slight, the. aggre ate. effect ofbringling these edges repeated y in rapid succes- "sion againstl-thewheel willbe very quickly' ioa noticeable. I,

roller is' free. to float or move longitudinally, .it automatically adjusts itselfzto the proper position, and duringthe ret-ruing operation there are no thrusts or forces tendingto It will be noted that as the cause the roller to cut unevenly on the faces of the cutting edge of the grinding wheel.

After onegroove of the roller becomes worn, due ftorepeated use, the cross slide may be moved to bring another groove 12 into position for retruing the grinding wheel, and after the grinding wheel is trued by the second groove, it may be employed to operate upon the worn groove to retrue that groove to its correct'shape and size. \Vhen retruing a groove 12 the grinding Wheel is rapidly rotated, and the roller is slowly rotated in the same direction so that the roller unequal speeds.

and the wheel at their points of engagement, are moving in opposite directions at Thus itwill be seen by following this methodthe roller and grinding wheel may be employed to retrue one another.

I claim as my invention: a

1. In an apparatus of the character de scribed, a rotary grinding wheel fixed against axial movement, a support, a shaft mounted therein in parallelism with the axis of said wheel, and a longitudinally fluted roller on said shaft and having a circumferential groove corresponding to the cut to be taken by said wheel, said roller having free axial movement whereby it may freely float longitudinally to accommodate itself in proper relation'to said wheel.

2, A device for giving to the active edge of a grinding wheela shape corresponding to that of a Whitworth thread to be cut and comprising a single piece metal roller havg a circumferential groove corresponding in shape to the cut to be taken by the wheel, said roller being longitudinally fluted to form transversely extending cutting edges,

3. In combination, a grinding wheel and wheel, the walls of said grooves being interruptedat intervals as described, a support for longitudinally Listing said roller so as to bring either of said grooves therein into operative relation to the' wheel, and means for feeding said wheel and roller relative to one another during the retruing operations, said roller being 'mounted for free floating endwise movement.

BENGT M. w. HANSON. 

